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Message-ID: <57D95FA3.3030103@intel.com>
Date: Wed, 14 Sep 2016 07:33:07 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-x86_64@...r.kernel.org
Cc: juerg.haefliger@....com, vpk@...columbia.edu
Subject: Re: [RFC PATCH v2 2/3] xpfo: Only put previous
userspace pages into the hot cache
On 09/14/2016 12:19 AM, Juerg Haefliger wrote:
> Allocating a page to userspace that was previously allocated to the
> kernel requires an expensive TLB shootdown. To minimize this, we only
> put non-kernel pages into the hot cache to favor their allocation.
Hi, I had some questions about this the last time you posted it. Maybe
you want to address them now.
--
But kernel allocations do allocate from these pools, right? Does this
just mean that kernel allocations usually have to pay the penalty to
convert a page?
So, what's the logic here? You're assuming that order-0 kernel
allocations are more rare than allocations for userspace?
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